Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c59e641c0aeaecd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 23:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a7560212b5780d3ecbdda1c01aa90f3 SHA-1: 93a9034945246383993b44fb628f692c2f95c17c SHA-256: 0c59e641c0aeaecd98606c31f1ab1b934f4e7b46bafbc2d4876de8bd0cbd8236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on compromised websites. While no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest it is designed to lure users into downloading further malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7b12a4e330be3bf9cc8c02b0d18d2c07/45192799293.pdf In PDF document text
    • http://thumpamonpally.com/userfiles/file/74157872412.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/32130792005.pdfIn PDF document text
    • https://tivicom.vn/upload/files/sokubumopani.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/ximilotigatatones.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/timagosajerel.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb43db6a65---pekela.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011608224395.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/latuvekotomajewer.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/kilowitubu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/49472689931.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/tagoranaf.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/8752081447.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/66175985617.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/47091649149.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/belasuzifoxuwozapuwiriz.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/83602084344.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/20993713103.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/45596191736.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/57368731332.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202108311713188625.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/ligadepokonavitovogimur.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/30616783746.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903145819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sci+fi+launcherPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/75a18a38491e05479cbba130bec19820/xivozowutim.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 17804 bytes
SHA-256: bba28715c346782fad3c25b936aa34b8a0cc6ce44bcfd03adf5fbc78258001d1
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10220 bytes
SHA-256: 5de476d4ba76f8f1856dd69285f542ad9f5d8c0b43be2ac839b1f6118b49962c
font_02_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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